We're dividing 121785 by 31 
We're looking to find how many times 31 goes into 121785.

On to step 1:
31 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 31

Let's proceed to step 2:
When dividing 12 by 31, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (1) from the dividend, attach it to 12 and continue: 121 / 31

Advancing to step 3:
121 divided by 31 is 3 with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 93 away from 121, we end up with 28.
Include the next digit (7) from the dividend after 28, then repeat: 287 / 31

Moving on to step 4:
31 can be fit into 287 9 times, resulting in a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
If we take 279 away from 287, we end up with 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 31

Advancing to step 5:
88 divided by 31 is 2 with a remainder of 26.
The number 2 becomes the next digit in our result. 
Result so far: 392.0
Deduct 62 from 88 and we're left with 26.
Take the next digit (5) from the dividend and append it to 26, then repeat: 265 / 31

Let's proceed to step 6:
31 can be fit into 265 8 times, resulting in a remainder of 17.
The number 8 becomes the next digit in our result. 
Result so far: 3928.0
If we take 248 away from 265, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
If we divide 170 by 31, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 3928.5
Deduct 155 from 170 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
The number 31 fits into 150 4 times, leaving a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 3928.54
If we take 124 away from 150, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 9:
When dividing 260 by 31, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 3928.548
The remainder is 12 after subtracting 248 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 10:
31 goes into 120 3 times with a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 3928.5483
Subtracting 93 from 120 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 11:
If we divide 270 by 31, we get 8 and a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 3928.54838
Deduct 248 from 270 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 12:
31 can be fit into 220 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 3928.548387
If we take 217 away from 220, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
The number 31 fits into 30 0 times, leaving a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 3928.548387
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 14:
If we divide 300 by 31, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 3928.54838709
The remainder is 21 after subtracting 279 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Our division results in 3928.54838709 with a remaining 2.1e-08.